Rate Adaption; Rfi (Radio Frequency Interference); Downstream And Upstream; Dsl Profiles - ZyXEL Communications MSC1024G Series User Manual

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The following table displays the calculation from a real length to an electrical length.

Table 79 Real Length to Electrical Length

11.2.10 Rate Adaption

Rate adaption is the ability of a device to adjust from the configured transmission rate to the

attainable transmission rate automatically depending on the line quality. The VDSL

transmission rate then stays at the new rate or adjusts if line quality improves or deteriorates.

The switch determines line quality using the Signal-to-Noise Ratio (SNR). SNR is the ratio of

the amplitude of the actual signal to the amplitude of noise signals at a given point in time. A

low SNR indicates poor line quality.

RFI is induced noise on the lines by surrounding radio frequency electromagnetic radiation

from sources such as AM and HAM radio stations. Since VDSL uses a much larger frequency

range that overlaps with other radio frequency systems, signals from VDSL lines and other

radio systems interfere with each other. To avoid performance degradation due to RFI, set the

switch to not transmit VDSL signals in the RFI band defined by the regulatory bodies (ETSI

and ANSI). You can also configure your own RFI bands on the system.

Downstream refers to traffic going out from the line card to the subscriber's DSL modem or

router. Upstream refers to traffic coming into the line card from the subscriber's DSL modem

A DSL profile is a table that contains a list of pre-configured DSL settings. Each DSL port has

one (and only one) profile assigned to it at any given time. You can configure multiple

profiles, including profiles for troubleshooting. Profiles allow you to configure DSL ports

efficiently. You can configure many DSL ports with the same profile, thus removing the need

to configure the settings of each DSL port one-by-one. You can also change an individual DSL

port's settings by assigning it a different profile.

MSC1000G/1024G/1224G Series User's Guide

REAL LENGTH TO ELECTRICAL LENGTH

=16.2*(cable length in kilometer)

=20.5*(cable length in kilometer)

=25.8*(cable length in kilometer)

Chapter 11 Subscriber Port Setup Screens

Msc1224g series Msc1000g series